On Wed, Nov 11, 2015 at 12:09:51AM +0000, Howard Chu wrote: > Unfortunately, PTHREAD_MUTEX_ROBUST_NP is an enum, not a macro, so > #ifdef won't work to detect it. > > The attached patch should work. Please report back; I won't merge it > unless we know it actually helps. Not sure you're aware, but there's RHEL5 (and thus Centos5 I believe) versions where glibc announces robust mutexes but the kernel is buggy: They are just not robust. tdb has a runtime check for this. Are you interested?